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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d1bf75295fd0add9bf0ef94dcb3ff212cc9b15f41b660d58d7f81372fc3158' 
  AND token = 'f46pxg/4yIYkTH+Ywik5TkffamVbjW/zP4CJCBZ6jks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}